Prescription eyeglasses are one of the most important tools used to correct refractive errors and improve visual quality. However, improper selection of eyeglasses can lead to negative consequences such as headaches, eye strain, and blurred vision. This article aims to highlight the most common mistakes made when choosing prescription eyeglasses and their adverse effects on visual performance and eye health. Common Mistakes in Choosing Eyeglasses One of the most common mistakes is relying on an inaccurate eye examination or using an outdated prescription, which results in lenses that do not match the patient’s current visual condition. Choosing an inappropriate frame size or shape may also cause visual distortion and discomfort during use. Neglecting the pupillary distance (PD) is another significant error, as it directly affects the optical center alignment of the lenses, leading to blurred or double vision. Additionally, selecting unsuitable lens types, such as lenses without anti-reflective coating or UV protection, can negatively affect eye health in the long term. Impact of These Mistakes on Vision Mistakes in selecting prescription eyeglasses can cause continuous visual fatigue, frequent headaches, neck and shoulder pain, and difficulty concentrating. They may also lead to reduced visual acuity, especially during reading or prolonged use of digital devices. In some cases, these errors may worsen refractive problems or create visual imbalance. Conclusion Choosing prescription eyeglasses should be done carefully through a comprehensive eye examination conducted by a qualified optical specialist, taking into consideration lens type, frame selection, and accurate visual measurements. Avoiding common mistakes in eyeglass selection significantly contributes to better vision quality and long-term eye health. University of Al-Mustaqbal – The First and Leading Private University